- TI TITAN chipset and TI voice engine
- 38 Programmable keys with dual-color LED for each
- Daisy-chain 6 modules for 228 programmable keys
- Dual color (red or green) LEDs for line status information
- Supports Busy Lamp Field(BLF), Bridge Line Appearance(BLA)
- Programmable for speed dialing, call pickup, Intercom,hold, transfer, voicemail, forward, DND...
- Applies to Yealink IP Phone SIP-T28P and SIP-T26P
- Expansion module(<2) is powered by the host phone